content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.expr;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.functions.BooleanSupplier;
  import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
  
  /**
   * When an Observer subscribes, the condition is evaluated and the appropriate
   * ObservableSource is subscribed to.
   *
   * @param <T> the common value type of the Observables
   */
  final class ObservableIfThen<T> extends Observable<T> {
  
      final BooleanSupplier condition;
  
      final ObservableSource<? extends T> then;
  
      final ObservableSource<? extends T> orElse;
  
      ObservableIfThen(BooleanSupplier condition, ObservableSource<? extends T> then,
              ObservableSource<? extends T> orElse) {
          this.condition = condition;
          this.then = then;
          this.orElse = orElse;
      }
  
      @Override
      protected void subscribeActual(Observer<? super T> observer) {
          boolean b;
  
          try {
              b = condition.getAsBoolean();
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              EmptyDisposable.error(ex, observer);
              return;
          }
  
          if (b) {
              then.subscribe(observer);
          } else {
              orElse.subscribe(observer);
          }
      }
  }
  